/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | foam-extend: Open Source CFD
   \\    /   O peration     | Version:     4.1
    \\  /    A nd           | Web:         http://www.foam-extend.org
     \\/     M anipulation  | For copyright notice see file Copyright
-------------------------------------------------------------------------------
License
	This file is part of foam-extend.

	foam-extend is free software: you can redistribute it and/or modify it
	under the terms of the GNU General Public License as published by the
	Free Software Foundation, either version 3 of the License, or (at your
	option) any later version.

	foam-extend is distributed in the hope that it will be useful, but
	WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
	General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with foam-extend.  If not, see <http://www.gnu.org/licenses/>.

\*---------------------------------------------------------------------------*/

#include "GAMGAgglomeration.H"

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

template<class Type>
void Foam::GAMGAgglomeration::restrictField
(
	Field<Type>& cf,
	const Field<Type>& ff,
	const label fineLevelIndex
) const
{
	const labelList& fineToCoarse = restrictAddressing_[fineLevelIndex];

	if (ff.size() != fineToCoarse.size())
	{
		FatalErrorIn
		(
			"void GAMGAgglomeration::restrictField"
			"(Field<Type>& cf, const Field<Type>& ff, "
			"const label fineLevelIndex) const"
		)   << "field does not correspond to level " << fineLevelIndex
			<< " sizes: field = " << ff.size()
			<< " level = " << fineToCoarse.size()
			<< abort(FatalError);
	}

	cf = pTraits<Type>::zero;

	forAll(ff, i)
	{
		cf[fineToCoarse[i]] += ff[i];
	}
}


template<class Type>
void Foam::GAMGAgglomeration::restrictFaceField
(
	Field<Type>& cf,
	const Field<Type>& ff,
	const label fineLevelIndex
) const
{
	const labelList& fineToCoarse = faceRestrictAddressing_[fineLevelIndex];

	cf = pTraits<Type>::zero;

	forAll(fineToCoarse, ffacei)
	{
		label cFace = fineToCoarse[ffacei];

		if (cFace >= 0)
		{
			cf[cFace] += ff[ffacei];
		}
	}
}


template<class Type>
void Foam::GAMGAgglomeration::prolongField
(
	Field<Type>& ff,
	const Field<Type>& cf,
	const label coarseLevelIndex
) const
{
	const labelList& fineToCoarse = restrictAddressing_[coarseLevelIndex];

	forAll(fineToCoarse, i)
	{
		ff[i] = cf[fineToCoarse[i]];
	}
}


// ************************************************************************* //
